Question: When did Hristo Stoichkov relieve from his/her membership from PFC CSKA Sofia sports team?
Paraphrase: When did Hristo Stoichkov's membership with the PFC CSKA Sofia sports team end?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q187125 p:P54 ?s . ?s ps:P54 wd:Q136433 . ?s pq:P582 ?value}